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针对当前微波传感器监测植被生长信息的实验方案不完善的问题,该文重新设计实验方案,主要研究玉米长高过程中微波辐射特性及叶面积指数的微波反演。研究结果表明:随着观测角度和页面指数(LAI)的增大,V和H极化的亮温都有明显变化;微波植被指数随观测角度和LAI的变化都有明显规律;测量方位对玉米的微波辐射特性有明显的影响作用;频率6.6GHz和观测角度为60°时,可利用归一化极化差植被指数(MPDI)进行较好的LAI反演。
In view of the current microwave sensor monitoring vegetation growth information experimental program is not perfect, this paper redesigned the experimental program, the main study of corn in the process of microwave radiation and leaf area index of microwave inversion. The results show that with the increase of the observation angle and the increase of the page index (LAI), the bright temperature of V and H polarization changes obviously. The change of microwave vegetation index with the observation angle and LAI has obvious rules. The microwave radiation characteristics have a significant effect on the LAI inversion. The normalized polarimetric difference vegetation index (MPDI) can be used to perform good LAI inversion when the frequency is 6.6GHz and the observation angle is 60 °.